Piguma series Because I use the pigment ink is water resistance that is hard to flow in the water. It is light resistance that direct sunlight does not fade even hit. It is not bleeding, even pulling from the top line marker. Applications: Labels such as a floppy disk. Note letter-illustration. Facsimile copy manuscript. Heat-sensitive copying, plate-making. Drawings, documents and save important documents. (Patent registered, trademarked, registered design)